Investment in Unconsolidated Joint Ventures - Wildwood Associates (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 29, 2020 USD ($) a	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Combined gross sales price		$ 435,833	$ 62,667	$ 372
Gain on sales of investments in unconsolidated joint ventures		$ 45,767	$ 0	$ 0
Wildwood Associates
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture		50.00%
Area of land | a	6.3
Combined gross sales price	$ 900,000
Gain on sales of investments in unconsolidated joint ventures	1,300
Company's investment balance	$ 520,000
Wildwood Associates | IBM
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture		50.00%